The anti-buckling fixture was originally designed for rigid plastics per ASTM D 695, reinforced plastics per ASTM D 3846. It was also extended and used for high-modulus composites. Boeing then adapted the fixture so that it would be self supported between two platens to ensure consistent perpendicularity of the fixture.
The SACMA standard followed the Boeing design with an added alternative support fixture with a cutout, which would allow bonded strain gages to be used at the center of the specimen for a more precise strain measurement.

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